cleanup, docs

site/doc/pages/file_unlink.txt

@@ -10,7 +10,5 @@ file_name : name of the file
 :content
 Deletes the file identified by `file_name`.
 
-## Related Concepts
-
-- PHP: `unlink()`
-- JavaScript / Node.js: Node `fs.unlinkSync()` or `fs.promises.unlink()`
+:example
+print("file_unlink example\n");